When a modified permanent storage page needs to be paged out (moved from memory to disk), it is written to a file system.

当经过修改的永久存储分页需要换出(从内存移动到磁盘)的时候，会将它写入到文件系统中。

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When a process references a page which is on disk, it must be paged, which could cause other pages to page out again.

当进程引用磁盘上的某个页面时，必须将其换入，这可能会导致将其他页面换出。

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When modified working storage pages need to be paged out (moved from memory to the disk), they are written to paging space.

当需要将经过修改的工作存储分页替换出(从内存移动到磁盘)时，它们将被写入到分页空间。

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